Aqueous ferrous waste conversion process

Details Aqueous ferrous waste conversion process Aqueous ferrous waste conversion process

C - Chemistry, Metallurgy

02

F

362/12

C02F 1/64 (2006.01)

Patent

CA 1124894

ABSTRACT OF THE DISCLOSURE An aqueous ferrous sulfate waste stream is converted into sludge and improved water effluent by a preferably ambient indoor temperature and pressure flow process comprising: turbently mixing said stream with a sub- stantial excess of gaseous oxygen and a small excess of impalpable calcium carbonate in a reaction zone until the iron content of said stream is vir- tually all sludged; classifying resulting sludge into a coarser solids frac- tion ( a portion of which is recycled to the sludging operation) and an aqueous suspension of finer solids; and separating finer solids from such aqueous suspension. As such streams usually contain free sulfuric acid, it is desirable to first precipitate from the stream a primary gypsum product by neutralization prior to such sludging operation.

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